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. 2017 Jun 7;13:163. doi: 10.1186/s12917-017-1076-6

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Posterior mean of the differential time effect (δ _i) for reported PRRS cases of 124 farms from 2012 to 2015. If δ _i < 0 then the farm specific trend is less steep than the mean trend, whilst δ _i > 0 implies that the farm specific trend is steeper than the mean trend. Star, Circle, triangle, multiply and plus represent finisher, WF, GDU, nursery and sow farm, respectively